From: Daniel Walker <dwalker@mvista.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, hzhong@gmail.com
Subject: Re: [PATCH] Profile likely/unlikely macros
Date: Tue, 25 Apr 2006 11:23:43 -0700 [thread overview]
Message-ID: <1145989423.3674.17.camel@localhost.localdomain> (raw)
In-Reply-To: <444DF5B4.6030004@yahoo.com.au>
On Tue, 2006-04-25 at 20:11 +1000, Nick Piggin wrote:
> I guess it is so it can be used in NMIs and interrupts without turning
> interrupts off (so is somewhat lightweight).
>
> But please Daniel, just use spinlocks and trylock. This is buggy because
> it doesn't get the required release consistency correct.
To use spinlock we would need to used the __raw_ types . As Hua
explained all of the vanilla spinlock calls use the unlikely macro. The
result is that we end up using atomic operations. So using them directly
seems like the cleanest method .
I'm not exactly sure what you mean by "release consistency" ?
Daniel
next prev parent reply other threads:[~2006-04-25 18:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-25 2:57 [PATCH] Profile likely/unlikely macros Daniel Walker
2006-04-25 3:06 ` Andrew Morton
2006-04-25 3:17 ` Daniel Walker
2006-04-25 10:11 ` Nick Piggin
2006-04-25 18:06 ` Hua Zhong
2006-04-25 18:23 ` Daniel Walker [this message]
2006-04-26 1:08 ` Nick Piggin
2006-04-26 9:56 ` Jörn Engel
2006-04-26 10:07 ` Nick Piggin
2006-04-25 23:14 ` Chen, Kenneth W
2006-04-25 9:19 ` Andreas Mohr
2006-05-01 22:05 ` Roland Dreier
-- strict thread matches above, loose matches on Subject: below --
2006-04-25 9:15 Mikael Pettersson
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